BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 95 FWB HVAC question- no heat, no A/C

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FUN-9C1



Posts : 145
Join date : 2009-05-09
Location : lakes region, NH

PostSubject: 95 FWB HVAC question- no heat, no A/C   Sun Nov 17, 2013 1:00 pm

I'm 95% sure I used the AC in my FWB at some point this summer and it worked fine. Toward the end of the summer I went to use it and it was no less than ambient temp. I figured it lost the charge, but then recently I went to use the heat, and no heat! The fan and everything works, just no temp control. I know the heater core is not clogged because I just flushed it out (and the block) right after I bought it this spring. I can't think of anything else that would cause no heat. My t-stat is good, eng gets to operating temp, coolant is full.

Following the instructions in the FSM, I went into the HVAC diagnostics and in the -02 pointer, it displayed 126, which I THINK means HVAC DTC 26, which is "Serial Data Communication". The first step is to check pin "M" at the DLC (the comm port under the dash). I cannot find anything that shows which pin is which. In the next steps, it mentions "terminal D12 at the HVAC control center". Anyone know how I find which one is that one? Am I on the right track? If I KNEW it was the HVAC module itself, I would probably replace it with a RM one, but looking at the FSM it looks more likely to be short somewhere. I sure hope that is not the case! I do have a known good HVAC module in my RMW. How hard would that be to swap temporarily?

Any help with that or any other ideas would be appreciated! THanks!



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95brmw



Posts : 1431
Join date : 2009-11-10
Age : 32
Location : Connecticut

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Sun Nov 17, 2013 1:40 pm

My RMW shows 126 too, but everything seems to work. Sounds like the blend door isn't moving to me. Start by disconnecting the battery for a few minutes, then after you reconnect it turn the ignition to run. The climate control will recalibrate itself so don't don't touch it for about 30 seconds. The blower will come on when it's done. During the calibration you should hear the blend door moving.
Try that out and see if it fixes it.
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FUN-9C1



Posts : 145
Join date : 2009-05-09
Location : lakes region, NH

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Sun Nov 17, 2013 9:17 pm

Thanks for the suggestion. I did the procedure you said, hopefully tomorrow I can get a chance to start 'er up and try the heat. I did hear something operate after turning the key on, I assume that was the door, then the fan came on like you said it would. It'd be awesome if it were that easy! I'll let you know after I try it.
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Mon Nov 18, 2013 9:55 am

If that doesn't work, try swapping in the roadie head unit. Plugs right in, so for testing purposes, it's simple. It'll take a few minutes longer to modify it to fit your dash, though.

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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FUN-9C1



Posts : 145
Join date : 2009-05-09
Location : lakes region, NH

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Tue Nov 19, 2013 5:29 pm

Well Dan's suggestion was worth a shot but still no worky worky.
So, what's easier, taking stuff apart to look at the heater/AC door, or taking stuff apart to try the RMW HVAC module?
Or any other suggestions?
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FUN-9C1



Posts : 145
Join date : 2009-05-09
Location : lakes region, NH

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Tue Nov 19, 2013 5:45 pm

Holy cow, I was just looking at my FSM and I don't think "module" was the word I wanted to use!! That looks like a PITA! I was under the impression it might be the controller (that's the word I meant to use)- the display and buttons unit. Is that what you were talking about, Bill?
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Tue Nov 19, 2013 6:47 pm

You can remove the middle bezel around the radio and climate control and swap that pretty quickly. You might be able to access the blend door motor from inside the glove box (behind the compartment)

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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Tue Nov 19, 2013 8:15 pm

Yeah Rob, I meant the control panel. easy to get out of both cars...

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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http://impalass.uniquekind.net/
Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Wed Nov 20, 2013 12:08 am

I have a bolt in already modified roadmaster climate contol for sale oculus interested. (instead of destroying a good one)
It is a perfectly good working climate control. Came from my own car,
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Wed Nov 20, 2013 3:24 am

Also check the vacuum manifold block under the passenger side of the dash. I had a line come loose but not off once and it caused no heat.
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miniz33



Posts : 25
Join date : 2014-03-20
Location : East Providence

PostSubject: Re: 95 FWB HVAC question- no heat, no A/C   Sat May 31, 2014 12:09 pm

Theres a procedure to have the climate control head do a sweep of the potentiometer in the blend door, I have the fleetwood manual with the procedure if you want me to post it? It should tell you the difference in desired position vs actual. My fw also has a 126, as did my last one and it didnt effect the A/C output if it makes you feel better. I'm leaning towards a failed actuator.
EDIT: Also forgot to mention mine, same codes, it was cured after I recently did one ground wire upgrade and the problem was solved! I bought a side post extended from autozone and a 19 inch 4 gauge weatherproof tractor battery cable, made an extra ground to the chassis where the battery cables clip to the frame, used a pre-existing bolt. Try it, it'll only cost 15 dollars, cut my ground side resistance by more than half. If only I can get it to idle now...
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